Update sklmessages_fr_FR.properties

[OkaetsuFox]

So i think those 3 change would fit better "Connecter comme.." meant "Connected like.." so i changed it to "Connecte en tant que.." wich is more suitable to speak about an entity/person. Pending wich mean "En attente" and not "experimental" like an experiment. and the last change is juste a short-cut, multiple were said shorter exept this one... It was Weird.